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LTC1347CSW#PBF

P1-P3P4-P6P7-P8
1
LTC1347
1347fa
5V Low Power RS232
3-Driver/5-Receiver Transceiver
with 5 Receivers Active
in Shutdown
■
Low Supply Current: 300µA
■
Five Receivers Kept Alive in Shutdown
■
ESD Protection Over ±10kV
■
Operates from a Single 5V Supply
■
Uses Small Capacitors: 0.1µF
■
Operates to 120kBaud
■
Three-State Outputs Are High Impedance When Off
■
Output Overvoltage Does Not Force Current Back
into Supplies
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
■
Pin Compatible with LT1137A and LT1237
■
Flowthrough Architecture
The LTC
®
1347 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300µA. The charge pump only
requires four 0.1µF capacitors.
In Shutdown mode, all five receivers are kept alive and the
supply current is 80µA. All RS232 outputs assume a high
impedance state in Shutdown and with the power off.
The LTC1347 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to ±25V
without damage, and can survive multiple ±10kV ESD
strikes.
■
Notebook Computers
■
Palmtop Computers
3-Drivers/5-Receivers with Shutdown
Quiescent and Shutdown Supply Current
vs Temperature
1347 TA01
V
CC
C1
0.1µF
LTC1347
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C3
0.1µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
NC
NC
V
–
V
+
C2
0.1µF
C4
0.1µF
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
1200
1000
800
600
400
200
0
20
40
60
1347 TA02
800
–40
120
100
80
60
40
20
0
SHUTDOWN CURRENT (µA)
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
TEST CONDITION:
V
CC
= 5V, ALL DRIVER INPUTS TIED TO V
CC
.
–20 100
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LTC1347
1347fa
Supply Voltage (V
CC
) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to V
CC
+ 0.3V
Receiver ............................................... – 25V to 25V
On/Off Pin.................................. – 0.3V to V
CC
+ 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to V
CC
+ 0.3V
Short-Circuit Duration
V
+
................................................................... 30 sec
V
–
................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
+
V
CC
C1
+
C1–
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
V–
C2+
C2–
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
NW PACKAGE
28-LEAD PDIP
TOP VIEW
SW PACKAGE
28-LEAD PLASTIC SO
G PACKAGE
28-LEAD SSOP
ORDER PART
NUMBER
LTC1347CG
LTC1347CNW
LTC1347CSW
T
JMAX
= 125°C, θ
JA
= 96°C/W (G)
T
JMAX
= 125°C, θ
JA
= 56°C/W (NW)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
DC ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive
● 5.0 7.0 V
Negative ● –5.0 – 6.5 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) ● 1.4 0.8 V
Input High Level (V
OUT
= Low) ● 2.0 1.4 V
Logic Input Current V
IN
= 5V ● 5 µA
V
IN
= 0V ● –5 µA
Output Short-Circuit Current V
OUT
= 0V ±9 ±12 mA
Output Leakage Current Shutdown, V
OUT
= ±20V (Note 3) ±10 ±500 µA
Any Receiver
Input Voltage Thresholds Input Low Threshold
● 0.8 1.3 V
Input High Threshold ● 1.7 2.4 V
Hysteresis ● 0.1 0.4 1.0 V
Input Resistance V
IN
= ±10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA (V
CC
= 5V) ● 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 5V) ● 3.5 4.8 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–15 –40 mA
Sourcing Current, V
OUT
= 0V 10 20 mA
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
3
LTC1347
1347fa
Note 3: Supply current and leakage current measurements in Shutdown
are performed with V
ON/OFF
= 0V.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Slew Rate R
L
= 3k, C
L
= 51pF 8 30 V/µs
R
L
= 3k, C
L
= 2500pF 3 5 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ● 2 3.5 µs
(TTL to RS232) t
LHD
(Figure 1) ● 2 3.5 µs
Receiver Propagation Delay t
HLR
(Figure 2) ● 0.3 0.8 µs
(RS232 to TTL) t
LHR
(Figure 2) ● 0.2 0.8 µs
AC CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Driver Output Voltage
TEMPERATURE (°C)
–40
–8
DRIVER OUTPUT VOLTAGE (V)
–6
–2
0
2
40
10
1347 G01
–4
0 100
4
6
8
–20
20
60 80
R
L
= 3k
OUTPUT HIGH
V
CC
= 5V
V
CC
= 4.5V
OUTPUT LOW
V
CC
= 4.5V
V
CC
= 5V
DATA RATE (kBAUD)
0
SUPPLY CURRENT (mA)
150
45
40
35
30
25
20
15
10
5
0
1347 G03
50 17525
75
100
125
V
CC
= 5V
R
L
= 3k
C
L
= 2500pF
3 DRIVERS ACTIVE
Supply Current vs Data Rate
TEMPERATURE (˚C)
–40
THRESHOLD VOLTAGE (V)
1.8
2.0
2.2
20 60
1347 G02
1.6
1.4
–20 0
40 80 100
1.2
1.0
V
TH
V
TL
Receiver Input Thresholds
DC ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Generator
V
+
Output Voltage I
OUT
= 0mA 8.0 V
I
OUT
= 12mA 7.5 V
V
–
Output Voltage I
OUT
= 0mA –8.0 V
I
OUT
= –12mA –7.0 V
Supply Rise Time Shutdown to Turn-On 0.2 ms
Power Supply
V
CC
Supply Current No Load (All Drivers V
IN
= 5V)(Note 2) ● 0.6 1.1 mA
No Load (All Drivers V
IN
= 0V) (Note 2) ● 0.8 1.3 mA
Shutdown (Note 3) ● 80.0 120.0 µA
On/Off Threshold Low ● 1.4 0.8 V
On/Off Threshold High ● 2.0 1.4 V
The ● denotes specifications which apply over the full operating
temperature range. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
The ● denotes specifications which apply over the full operating temperature range.
V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
P1-P3P4-P6P7-P8

LTC1347CSW#PBF

Mfr. #:
Buy LTC1347CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 5V 2Dx/2Rx RS232w/ 2Rx KeepAlive
Lifecycle:
New from this manufacturer.
Delivery:
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